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I always assumed the vents were to keep the engine bay at a reasonable temperature. On hot summers days I arrive home to find the vents have opened. The "control units" are nice -- they don't require electricity to operate.
The presence of the vents also demonstrates that the belly panels do keep a certain amount of air around the engine. This helps a cold engine to warm up faster but when it gets too warm the hot air must be vented.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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